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Using Intelligent Output Terminals Section 4-6
4-6-8 Output Deviation for PID Control
The PID loop error is defined as the
magnitude (absolute value) of the dif-
ference between the Setpoint (target
value) and the Process Variable
(actual value). When the error magni-
tude exceeds the preset value for
C044, the [OD] terminal signal turns
ON. Refer to "PID Loop Operation" on
page 87.
Option
Code
Terminal
Symbol
Function
Name
State Description
04 OD Output
Deviation for
PID Control
ON when PID error is more than the set
threshold for the deviation signal
OFF when PID error is less than the set
threshold for the deviation signal
Valid for inputs: 11, 12, AL0 - AL2
Required settings: C044
Notes:
• The default difference value is set to 3%. To change this value, change parameter
C044 (deviation level).
• The example circuit for terminal [11] drives a relay coil. Note the use of a diode to
prevent the negative-going turn-off spike generated by the coil from damaging the
inverter's output transistor.
C044
C044
t
SP, PV
Setpoint
0
1[OD]
signal
ON
ON
Process variable
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